Whenever I look around, it instantly moves my head to a different direction!

Well, whenever I begin to look around, it instantly makes my head jerk a different direction and I got lagged very hard whenever I look now. I can move just fine, but looking is terrible. It just suddenly started one day during pvp.

What I expected to happen was...:
to be able to look around normally and PvP!

What actually happened was...:
I got my FOV (field of vision) pointed in a different direction and I lagged out.

Steps to Reproduce:
1. All I have to do is just look.

Down below, the first screenshot is me looking then I barely poked my mouse and BAM! LAG! And I'm at the 2nd screenshot...